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PATENTED FEB. 2, 1904. M. S.'NAPIER-& A. J. ROWLEDGE. GARBURETER FORPETROL MOTORS.

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PATENTED THE. 2, 1904. M. s. NAPIER a; A. J. ROWLEDGE. GARBURETER FORPETROL MOTORS.

APPLICATION FILED SEPT. 26, 1903.

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EH5 co. PHUTO-LITHO. WASHINGTON n c No. 751,434. PATENTED FEB. 2, 1904.

M. S. NAPIER & A. 'J. ROWLEDGE. GARBURETBR FOR PETROL MOTORS.

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- Patented February 2, 1904.

UNITED STATES PATENT; OFFICE.

MONTAGUE' NAPIER AND ARTHUR JOHN ROWLEDGE, OF LONDON,

ENGLAND; SAID ROWLEDGE ASSIGNOR TO SAID NAPIER.

CAR'BURETER Foe PETROL-MOTORS.

SPECIFICATION forming part of Letters Patent No. 751,434, dated February2, 1904.

Application filed $epte1nber 26,1903. Serial No. l'74,'790. (No model.)7

. motors, and is especially applicable to automobiles. With the usualarrangements in "these motors where air is drawn into the cylinderthrough a oarbureter if the air valve and passages are so arranged as toadmit air in the best proportion for the explosive mixture when themotor is running at any particular speed it is found that when the speedis increased the proportion of air in the explosive mixture is usuallytoo small.

The object of the presentinvention is to enablethe automatic adjustmentof the air-supply to be readily effected in an advantageous manner.

The .invention consists in a form of regulating device in which theair-supply is automatically controlled by means of a diaphragm or pistonwhich is exposed on one side to the atmospheric pressure and on theother side to a pressure greater or less than the atmospheric byan'amount which varies with the'speed of the motor, such pressuredifference being obtained from the pressure difference at a point in thejacket-Water circulation.

Referring to the accompanying drawings, Figure 1 is a sectionalelevation of one form of the apparatus. Fig. 2 is a similar view ofanother form. In these two forms the airsupply is controlled by themovements of a diaphragm. Fig. 3 shows a form in which the control iseffected by means of a piston. Fig. 4 shows a form in which a diskconnected to the air-valve is subjected to the pressure of the inflowingwater.

In the apparatus shown in Fig. 1 the main air-supply is drawn into thecarburetor 5 through a pipe a, passing over a nozzle 6, screwed into thepipe and communicating with a pocket '0, to Which the petrol issupplied. The petrol from the nozzle 6 is takenup by the air in theusual way. A pipe 65 for an ad- 5 ditional air-supply is connected asshown, this air-supply being controlled by a piston-valve e, the spindlef of which is pressed by the spring it against a stud a, secured to thecenter of the diaphragm k. This diaphragm, is is secured between thetwopartsZ and m of a casing.. Awater-inlet n is pro'videdon the part m, towhich a pipe 1 may be connected, leading to the delivery-pipe of a pump2, driven from the motor-shaft 3. The pressure of de- 5 livery of thispump, which supplies cooling water to the jacket 4 of the motor-cylinder5, consequently varies with the speed of the motor, and these pressurevariations are transmitted to the under side of the diaphragm k. 7 Theupper portion Z of the casing is extended upward as a cylinder 7,divided into two portions by a partition 3. Openings t below thispartition place the upper side of the diaphragm in communication withthe atmosphere. The piston-valve e is adapted to work in the upperportion of the cylinder 1' and to admit air to the pipe 41 through ports0 when the valve 6 is raised by an increase of pressure below thediaphragm, the amount of opening of the ports 30 0 being proportional tothe increase of pressure. The proper proportion of air in'the explosivemixture is thus maintained.

In the form shown in Fig. 2 the main air admission takes place aroundthe cylinder 1-, 5 in which the valve 6 works, the auxiliary airentering through ports 0, as before.

In the form shown in Fig. 3 a piston or is substituted for the diaphragmis, the arrangement being otherwise the same as that shown 9 in Fig. 1.

Fig. 4 shows a form of the apparatus in which the spindle f of the valve6 passes through a sleeve w into a chamber 11 and carries a disk 00,water being admitted to the chamber n through the inletn, opposite whichthe disk as is disposed. The water escapes from the chamber o throughthe pipe 2. The

disk w takes up a position in accordance with the rate of inflow ofwater through the pipe 77., and the air admission is, as in the previouscases, controlled by the valve 6 and the ports 0.

By means of this device the proportion of air in the charge isautomatically adjusted in accordance with the speed of the motor.

Having now described our invention, what We claim as new, and desire tosecure by Letters Patent, is

1. In an apparatus for controlling the admission of air to thecarbureter of an internal-combustion engine, the combination of anelement subjected to the pressure of the cylinder-cooling water, avalve-spindle, a spring holding the spindle in contact with the saidelement, a valve carried by the spindle, and airadmission portscontrolled by the said valve, whereby the said ports are opened when thepressure of the cooling water increases, substantially as set forth.

2. In an apparatus for controlling the admission of air to thecarburetor of an internal-combustion engine, the combination of adiaphragm, a casing containing the diaphragm, a pipe connecting thecasing to a point in the cylinder-cooling Water-pipes, a valve-spindle,a spring pressing the valve spindle against the diaphragm, a valvecarried by the spindle, and air admission ports controlled by the valve,whereby the said ports are opened when the pressure of the cooling waterincreases, substantially as described.

3. In an apparatus for controlling the admission of air to thecarburetor of an internal-combustion engine, the combination of apiston, a cylinder, a pipe connecting the cylinder to a point in thecylinder-cooling waterpipes, a valve-spindle, a spring pressing thevalve-spindle against the piston, a valve carried by the spindle, andair admission ports controlled by the valve, whereby the said ports areopened when the pressure of the cooling water increases, substantiallyas described.

4:. In an apparatus for controlling the admission of air to thecarburetor of an internal-combustion engine, the combination of acasing, a pipe through which water is led to the casing, an elementarranged opposite to the waterinlet, a spindle carrying the saidelement, a spring holding the spindle in position, a valve carried bythe spindle, air-admission ports controlled by the valve, and a pipethrough which the water escapes from the casing, substantially asdescribed.

In witness whereof we have hereunto set our hands in presence of twowitnesses.

MONTAGUE S. NAPIER. ARTHUR JOHN ROWLEDGE. Witnesses:

FREDK. A. DANIEL, BERTRAM H. MATTHEWS.

